Wall or surface for deadening sound



J. K. SHAW.

WALL OR SURFACE FOR DEADENING SOUND.

APPLICATION FILED MAY23. 1918.

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ATTORNEY.

UNITED STATES PATENT OFFICE.

JOHN K. SHAW, or MINNEAPOLIS, MINNESOTA, ASSIGNOR TO B. e. DAHLBERG, or

ST. PAUL, MINNESOTA.

Specification of Letters Patent.

Patented July 5, 1921.

Application filed May 23, 1918. Serial No. 236,159.

T 0 all whom it may concern Be it known that I, J OHN K. SHAW, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Valls or Surfaces for Deadening Sounds; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a wall or surface especially adapted for deadening sounds, and has for its object to provide a structure of this kind which will be comparatively inexpensive to construct, will-be highly ornamental in appearance, and will be more efiicient in use than those heretofore proposed.

lVith these and other objects in view the invention consists in the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out in the claim.

Referring to the accompanying drawings forming a part of this specification, in which like numerals designate like parts in all the views Figure l is a diagrammatic sectional view of a wall or surface made in accordance with this invention,

Fig. 2 is an enlarged detail sectional view of a portion of the parts shown in F ig. 1;

Fig. 3 is an exaggerated perspective view of a portion of the insulite or paper board material out of which the panels are made;

Fig. 4 is adiagrammaticview showing a modified form of insulite blocks suitable for this-invention; and

Fig. 5 is another diagrammatic view showing a form of block similar to those illustrated in Fig. l.

'In order that the precise invention may be the better understood it is said :Some of the problems to be overcome in this invention are set forth in Patent #859,488, July 9, 1907, to Dolmetsch; but this invention differs from the disclosure-of said patent in that the paper board, or insulite material from which the deadening surface is to be formed differs very materially from ordinary paper board and from other materials which have been hereto-fore used for this purpose.

Thatis to say,- the paper board is composed partly of relatively very large fibers or slivers 1 which are sometimes as much as one elghth of an inch wide and one half an inch long. These said slivers are mixed with other fiberswhich are more of a threadhke appearance, they being say from one thirty second of an inch in diameter to one sixty fourth of an inch in diameter, and one or two inches long. These said sliver-like and thread-like fibers are further mixed with a third class of fibers which are more hair like than anything else which may be said to be from one hundredth of an inch in diameter, to one two-hundredth of an inch in diameter, and one or two inches long. The above mentioned three classes of fibers are further mixed with other finer fibers and shorter fibers which are or may be identical with those used in the making of paper. All of these various fibers as well as other fibers, not necessary to mention, are felted or compressed together into boards or panels which are of an exceedingly porous nature, and closely resemble cork in their physical properties.

The porosity of this said board material is so great that its specific gravity is not board constitutes a heat insulating material of very high quality, and owing to its very great porosity it' also constitutes a sound deadening material which is not only comparatively' inexpensive to produce, but it is of a very high efliciency in action.

The material is conveniently made in a manner similar to the making of ordinary paper board and is easily formed into blocks or slabs, such as2 illustrated in Fig. 1,or'such as 3, illustratedin Fig. 4. These said blocks or slabs 2 make joints 4 with each other whi'chare preferably staggered as shown, and they are conveniently set in asphalt,

.paste, pitch, glue, plaster, cement or other often more than .2 to .3. The result is the enabled to readily penetrate into the interstices between the fibers as is diagrammatically illustrated at the point 7 in Fig. 2. It results from this structure that a firm and very. tenacious bond is had between the plastie material 5 and the insulite blocks 2, so that the said blocks may be readily laid upon the wet or sticky plastic material 5 and the sound deadening surface thus readily built up. In addition to this, the blocks 2 may be readily colored to imitate stone,

wood or other material, and the various as that illustrated and surfaced with the above mentioned insulite blOiOkS is found to deaden the sound with an efiiciency equal to that of cork and therefore, it is very useful in hospitals, churches, halls, auditoriums, and in fact everywhere where it is desired to combine quietness with ornamentation.

It is obvious that those skilled in the art may vary the details of construction as well as the arrangement of parts, and the uses to which this invention may be put, and therefore, I do not wish to be limited to the above disclosure except as may be required by the claim.

What I claim is A sound deadening wall comprising a supporting structure; plaster applied to said structure; a surfacing material in the form of blocks ornamented in keeping with their surroundings and provided with pores applied to said plaster while in its green state, said plaster adhering to said blocks and en-' tering said pores; said blocks being each composed of four sets of fibers differing in coarseness to such an extent that their specific gravity is less than four-tenths and a large proportion of air is entrained in their body portions to impart to said blocks unusual sound deadening qualities, substantially as described. I

In testimony whereof I aflix my signature.

JOHN K. SHAW. 

